Both the name "cave" and the scientific name spelaeus derive from the fact that fossils of this species were mostly found in caves, indicating this species spent more time in caves than the brown bear, which only uses caves for hibernation. Consequently, in the course of time, whole layers of bones, almost entire skeletons, were found in many caves.

Contents

Taxonomy[edit source | edit]

Cave bear skeletons were first described in 1774 by Johann Friederich Esper in his book Newly Discovered Zoolites of Unknown Four Footed Animals. Originally thought to belong to dragons, unicorns, apes, canids or felids, Esper postulated they actually belonged to polar bears. Twenty years later, Johann Christian Rosenmüller, an anatomist at the Leipzig University, gave the species its binomial name. The bones were so numerous, most researchers held little respect for them. During World War I, large amounts of cave bear bones were used as a source of phosphates, leaving behind little more than skulls and leg bones.[1]

Evolution[edit source | edit]

Skeleton mounted in quadrupedal posture

Both the cave bear and the brown bear are thought to be descended from the Plio-Pleistocene Etruscan bear (Ursus etruscus)[3][4][5] that lived about 5.3 Mya to 10,000 years ago. The last common ancestor of cave bears and brown bears lived between 1.2 and 1.4 Mya.[6] The immediate precursor of the cave bear was probably Ursus deningeri (Deninger's bear), a species restricted to Pleistocene Europe about 1.8 Mya to 100,000 years ago.[7][8] The transition between Deninger's bear and the cave bear is given as the last Interglacial, although the boundary between these forms is arbitrary, and intermediate or transitional taxa have been proposed, e.g. Ursus spelaeus deningeroides,[9] while other authorities consider both taxa to be chronological variants of the same species.[10]

Cave bears found in different regions vary in age, thus facilitating investigations into evolutionary trends. The three anterior premolars were gradually reduced, then disappeared, possibly in response to a largely vegetarian diet. In a fourth of the skulls found in the Conturines, the third premolar is still present, while more derived specimens elsewhere lack it. The last remaining premolar became conjugated with the true molars, enlarging the crown and granting it more cusps and cutting borders. This phenomenon, known as molarization, improved the mastication capacities of the molars, facilitating the processing of tough vegetation. This allowed the cave bear to gain more energy for hibernation, while eating less than its ancestors.[11]

Description[edit source | edit]

Life restoration

The cave bear had a very broad, domed skull with a steep forehead. Its stout body had long thighs, massive shins and in-turning feet, making it similar in skeletal structure to the brown bear.[12] Cave bears were comparable in size to the largest modern-day bears. The average weight for males was 400–500 kilograms (880–1102 pounds), while females weighed 225–250 kg (496–551 lbs).[13] Of cave bear skeletons in museums, 90% are male due to a misconception that the female skeletons were merely "dwarfs". Cave bears grew larger during glaciations and smaller during interglacials, probably to adjust heat loss rate.[14] Cave bears of the last Ice Age lacked the usual two or three premolars present in other bears; to compensate, the last molar is very elongated, with supplementary cusps.[15] The humerus of the cave bear was similar in size to that of the polar bear, as were the femora of females. The femora of male cave bears, however, bore more similarities in size to those of kodiak bears.[13]

Behaviour[edit source | edit]

Dietary habits[edit source | edit]

Cave bear teeth show greater wear than most modern bear species, suggesting a diet of tough materials. However, tubers and other gritty food, which cause distinctive tooth wear in modern brown bears, do not appear to have constituted a major part of cave bears' diets on the basis of dental microwear analysis.[16]

Skull of Ursus spelaeus: Cave bears lacked the usual two or three premolars present in other bear species.

The morphological features of the cave bear chewing apparatus, including loss of premolars, have long been suggested to indicate their diets displayed a higher degree of herbivory than the Eurasian brown bear.[3] Indeed, a solely vegetarian diet has been inferred on the basis of tooth morphology.[4] Results obtained on the stable isotopes of cave bear bones also point to a largely vegetarian diet in having low levels of nitrogen-15 and carbon-13,[17][18] which are accumulated at a faster rate by carnivores as opposed to herbivores.

However, some evidence points toward the occasional inclusion of animal protein in cave bear diets. For example, toothmarks on cave bear remains in areas where cave bears are the only recorded potential carnivores suggests occasional cannibalistic scavenging,[19][20] possibly on individuals that died during hibernation, and dental microwear analysis indicates the cave bear may have fed on a greater quantity of bone than its contemporary, the smaller Eurasian brown bear.[21] Additionally, cave bear remains from Peştera cu Oase in the southwestern tip of the Carpathian Mountains had elevated levels of nitrogen-15 in their bones, indicative of omnivorous diets,[18][22] although the values are within the range of those found for the strictly herbivorous mammoth.[23]

Although the current prevailing opinion concludes that cave bears were largely herbivorous, and more so than any modern species of the genus Ursus,[24] increasing evidence points to omnivorous diets, based both on regional variability of isotopic composition of bone remains indicative of dietary plasticity,[18][22] and on a recent re-evaluation of craniodental morphology that places the cave bear squarely among omnivorous modern bear species with respect to its skull and tooth shapes.[25]

Mortality[edit source | edit]

Standing skeleton of juvenile cave bear

Death during hibernation was a common end for cave bears, mainly befalling specimens that failed ecologically during the summer season through inexperience, sickness or old age.[26] Some cave bear bones show signs of numerous different ailments, including fusion of the spine, bone tumours, cavities, tooth resorption, necrosis (particularly in younger specimens), osteomyelitis, periostitis, rickets and kidney stones.[12] Male cave bear skeletons have been found with broken bacula, probably due to fighting during the breeding season.[26] Cave bear longevity is unknown, though it has been estimated that they seldom exceeded 20 years of age.[1] Paleontologists doubt adult cave bears had any natural predators, save for pack-hunting wolves and cave hyenas, which would probably have attacked sick or infirm specimens.[1] Cave hyenas are thought to be responsible for the disarticulation and destruction of some cave bear skeletons. Such large carcasses were an optimal food resource for the hyenas, especially at the end of the winter, when food was scarce.[27] The presence of fully articulated adult cave lion skeletons, deep in cave bear dens, indicates the lions may have occasionally entered dens to prey on hibernating cave bears, with some dying in the attempt.[28]

Recovery of fossil DNA[edit source | edit]

In May 2005, scientists in California succeeded in recovering and sequencing the nuclear DNA of a cave bear that lived between 42,000 and 44,000 years ago. The procedure used genomic DNA extracted from the animal's tooth. Sequencing the DNA directly (rather than first replicating it with the polymerase chain reaction), the scientists were able to recover 21 cave bear genes from remains that did not yield significant amounts of DNA with traditional techniques.[29] This study confirmed and built on results from a previous study using mitochondrial DNA extracted from cave bear remains ranging from 20,000 to 130,000 years old.[6] Both show the cave bear to be more closely related to the brown bear and polar bear than the American black bear, but having split from the brown bear lineage prior to the diversification of distinct eastern and western brown bear lineages and prior to the split of brown bears and polar bears. The divergence date estimate of cave bears and brown bears is about 1.2–1.4 Mya.[6]

Range and habitat[edit source | edit]

Cave bear and other Ice Age mammals, Grotte de la Mairie

The cave bear's range stretched across Europe; from Spain and Great Britain in the west, Italy, parts of Germany, Poland, the Balkans, Romania and parts of Russia, including the Caucasus; and northern Iran. No traces of cave bears have been found in Scotland, Scandinavia or the Baltic countries, which were all covered in extensive glaciers at the time. The largest numbers of cave bear remains have been found in Austria, Switzerland, southern Germany, northern Italy, northern Spain, Croatia, Hungary, and Romania. The huge number of bones found in southern, central and eastern Europe has led some scientists to think Europe may have once had literally herds of cave bears. Some, however, point out though some caves have thousands of bones, they were accumulated over a period of 100,000 years or more, thus requiring only two deaths in a cave per year to account for the large numbers.[1]

The cave bear inhabited low mountainous areas, especially in regions rich in limestone caves. They seem to have avoided open plains, preferring forested or forest-edged terrains.[1]

Extinction[edit source | edit]

Rearing Ursus spelaeus skeleton

Recent reassessment of fossils indicate that the cave bear probably died out 27,800 years ago. A complex set of factors, rather than a single factor, are suggested to have led to the extinction.[30][31]

Compared with other megafaunal species that also became extinct during the last glacial maximum, the cave bear was believed to have had a more specialized diet of high-quality plants and a relatively restricted geographical range. This was suggested as an explanation as to why it died out so much earlier than the rest.[24] Some experts have disputed this claim, as the cave bear had survived multiple climate changes prior to extinction. Additionally, mitochondrial DNA research indicated that the genetic decline of the cave bear began long before it went extinct, demonstrating habitat loss due to climate change was not responsible.[30] Finally, high δ15N levels were found in cave bear bones from Romania, indicating wider dietary possibilities than previously believed.[18]

Overhunting by humans has been largely dismissed because human populations at the time were too small to pose a serious threat to the cave bear's survival, though the two species may have competed for living space in caves.[1][30] Unlike brown bears, cave bears are seldom represented in cave paintings, leading some experts to believe the cave bear may have been avoided by human hunters[32] or their habitat preferences may not have overlapped. The late paleontologist Bjorn Kurtenhypothesized cave bear populations were fragmented and under stress even before the advent of the glaciers.[1] Populations living south of the Alps possibly survived significantly longer.[24]

Some evidence indicates that the cave bear only used caves for hibernation and was not inclined to use other locations, such as thickets, for this purpose, in contrast to the more versatile brown bear. This specialized hibernation behavior would have caused a high winter mortality rate for cave bears that failed to find available caves. Therefore, as human populations slowly increased, the cave bear faced a shrinking pool of suitable caves, and slowly faded away to extinction, as both Neanderthals and anatomically modern humans sought out caves as living quarters, depriving the cave bear of vital habitat. This hypothesis is being researched at this time. According to the research study, published in the journal Molecular Biology and Evolution, radiocarbon dating of the fossil remains shows that the cave bear ceased to be abundant in Central Europe around 35,000 years ago. "This can be attributed to increasing human expansion and the resulting competition between humans and bears for land and shelter," explains the scientist, who links this with the scarce fossil representation of the bear's prey in the abundant fossil record of this species.[33]

Relationship with humans[edit source | edit]

Between the years 1917-1923, the Drachenloch cave in Switzerland was excavated by Emil Bächler. The excavation uncovered more than 30,000 cave bear skeletons. It also uncovered a stone chest or cist consisting of a low wall built from limestone slabs near a cave wall with a number of bear skulls inside it. Also, a cave bear skull was found with a femur bone from another bear stuck inside it. Scholarship speculated that this was proof of prehistoric human religious rites involving the cave bear, or that the Drachenloch cave bear were hunted as part of a hunting ritual or that the skulls were kept as trophies.[34] In Archaeology, Religion, Ritual (2004), archaeologist Timothy Insoll strongly questions whether the Drachenloch finds in the stone cist were the result of human interaction. Insoll states that the evidence for religious practices involving cave bears in this time period is "far from convincing". He also states that comparisons with the religious practices involving bears that are known from historic times are invalid.[35]

A similar phenomenon was encountered in Regourdou, southern France. A rectangular pit contained the remains of at least 20 bears, covered by a massive stone slab. The remains of a Neanderthal lay nearby in another stone pit, with various objects, including a bear humerus, a scraper, a core, and some flakes, which were interpreted as grave offerings.

The unusual finding in a deep chamber of Basua Cave in Savona, Italy, is thought to be related to cave bear worship, as there is a vaguely zoomorphic stalagmite surrounded by clay pellets. It was apparently used by Neanderthals for a ceremony; bear bones scattered on the floor further suggests this was likely to have had some sort of ritual purpose.[36]

^ abcdTrinkaus, Erik & Richards, Michael P. (2008). "Reply to Grandal and Fernández: Hibernation can also cause high δ15N values in cave bears". Proceedings of the National Academy of Sciences of the United States of America105 (11): E15. doi:10.1073/pnas.0801137105.